Display device

Details Display device Display device

2004-11-24

2009-08-18

Ward, John A (Department: 2885)

Optical: systems and elements

Diffusing of incident light

C359S620000, C362S618000

Reexamination Certificate

active

07576915

ABSTRACT:
A display device comprises a light emitting picture element (120) and a contrast enhancing element (110). The contrast enhancing element comprises a plurality of wave guides (216) separated by interstitial regions (212) being formed as narrowing recesses. An interface between a wave guide (216) and an interstitial region (212) is provided with a reflective layer. The narrowing recesses form a dead end for incident ambient light which is efficiently absorbed by the contrast enhancing element. On the other hand, light emitted by the picture element (120) of the display device is transmitted through the wave guides (216). As a result, the display device has a relatively high contrast ratio, particularly under bright ambient light conditions.

REFERENCES:
patent: 5462700 (1995-10-01), Beeson et al.
patent: 5521726 (1996-05-01), Zimmerman et al.
patent: 6538813 (2003-03-01), Magno et al.
patent: 1126520 (1996-07-01), None
Chinese Office Action issued on Sep. 14, 2007 to be placed in the file but not considered by the Patent Office.

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